A police raid on a Jakarta tenement building turns into a non-stop bloodbath when the drug dealer who owns it unleashes a furious barrage of fists, bullets, and blades, leaving the few remaining survivors of the invading SWAT team to fight their way up to the top and end the psychotic criminal's violent reign once and for all. Expectant father Rama (Iko Uwais) is an honest cop with deadeye aim and killer fighting skills. Following orders from his lieutenant -- a respected police veteran and mastermind of the ambitious raid -- Rama leads his heavily-armed team into the building silently and stealthily. Their mission is to take down Tama (Ray Sahetapy), a vicious criminal kingpin who uses the building as a shelter for both his many customers and his small army of loyal dealers and killers.

Even the bravest cops in the city have never dared to breach Tama's fortress, and once the team's cover is blown, it quickly becomes apparent why; almost immediately, half of the team is shredded in a vicious barrage of gunfire and machetes. The exits have all been blocked, and with Tama's men closing in fast Rama's only hope is to keep going up and take out anyone who gets in his path. Meanwhile, Tama realises that some of the cops have managed to survive the initial assault, so he unleashes two of his best men to stop them dead in their tracks. With his team cut down to a mere handful and his munitions exhausted, the determined cop vows to complete his mission by whatever means necessary.